Gas cleaner



Nov. 30, 1965 P. M. VAN DER MEER GAS CLEANER Filed June 20, 1961 FIG! United States Patent 3,220,168 GAS CLEANER Pieter Marinus van der Meer, Gemaalweg 6, Lemmer, Netherlands Filed June 20, 1961, Ser. No. 118,415 5 Claims. (Cl. 55-422) v composed of a series of frusto-conical identical sleeves converging in the direction of the influent gas stream and separated from each other by annular slits.

In such known gas cleaners the gas streams laterally branching off from the main gas stream will have the highest speed in the places where the branch streams begin, that is to say, upon entering a frusto-conical sleeve. The passage area of the annular slits between the sleeves gradually increases; and the speed of the branching oil gas streams therefore is greatest at the beginning and gradually decreases.

It is an object of the invention to improve known cleaners by providing a different apportionment of the speed such that the speed of the branching ofl streams is greatest adjacent the periphery of the series of sleeves. As a result of the relatively low speed of the stream .at the place where it starts branching off from the main stream, impurities will not be entrained, while the higher speed of the stream which flows out of the annular slit between two sleeves is not objectionable because the gas upon entering said slit has already been freed of its impurities.

The gas cleaner according to the invention is characterized in that each sleeve has its wider rim provided with a cylindrical collar lengthening the sleeve. By means of said collar on each sleeve the result is achieved that the conical sleeves which with their converging portions are spaced relatively far apart form a discharging means for cleaned gas provided with a series of outflow slits in which locally the highest speed in the branched-off gas streams can occur.

Due to the throttling effect of the outlet slits at the end of the gas paths between the sleeves the total space between said sleeves additionally acts as a settling and dustcollecting space for that portion of the impurities in the gas to be cleaned which has been entrained in the branched-off stream after the additional cleaning.

An embodiment of the gas cleaner according to the invention will be described with reference to the accompanying drawing wherein FIGURE 1 is a longitudinal section of said cleaner, and

FIGURE 2 is an enlarged view of a portion of the cleaner.

The gas to be cleaned is supplied to the cleaner through a supply conduit 1 ending in a nozzle 2, which nozzle is provided with an external projecting rim 3. An assembly of substantially cylindrical sleeves 49 is connected to the nozzle 2, the conduit 1 and sleeves 4-9 constituting gas supply means. Each of said sleeves has a funnel-shaped narrowed portion, which for sleeve 4 is designated by the numeral 10 and tapers from the associate sleeve and in a direction away from the gas supply means. The sleeves 4-9 are interconnected by three axial spacer plates extending in a radial direction, two of which are visible in FIGURE 1 and are designated by the numerals 11 and 12. Said three spacer plates are angularly arranged around the sleeves to enclose angles of 120. The sleeves 49 which have a common axis (as shown by the dashdot line) are welded to the spacer plates such that an annular slit is left between the sleeves. The slit between 3,220,168 Patented Nov. 30, 1965 sleeves 4 and 5 is designated by the numeral 13. From the top downwards the slits between the successive sleeves have a gradually decreasing area. Against the lower side of the spacer plates 11 and 12 as well as against the sleeve 9 a supporting plate 14 is Welded, the edge of which is downwardly flanged to form a collar. A much wider casing 15 concentrically surrounds the sleeves 4-9. The nozzle 2 is secured in the upper portion of the casing 15. Located adjacent the nozzle 2 is a discharge conduit 16 which is likewise secured in the upper portion of the casing 15, through which discharge conduit 16 the cleaned gas is carried off. The conduit 16 and the portion of the casing above plate 14 constitute gas discharge means. A discharge duct 17 for the impurities is connected to the lower portion of the casing 15 for the collection of impurities which are deposited in the collection chamber 27 in the casing 15 below the plate 14. Said duct 17 can be closed and opened respectively by means of a stop-valve 18. Against the inner wall of the casing 15 three lugs are welded Which are spaced apart, two of the lugs being designated by the numerals 19 and 21). In said lugs 19 and 20 screw-threaded bolts 21 and 22 are secured.

Said bolts extend through corresponding holes in the supporting plate 14, while nuts 23 and 24 are threaded on said bolts, which nuts bear against the lower side of the supporting plate 14. By screwing said nuts further onto the associated bolts the supporting plate 14 is moved upwardly, so that at the same time the assembly of sleeves 49 and the three spacer-plates, two of which are designated by the numerals 11 and 12, can be raised. The sleeve 4 has its upper end in sealing engagement with the gas supply conduit 1 by means of a collar 25 which is adapted to slide along the nozzle 2 in sealed relationship therewith, the uppermost position of the sleeve being determined by the projecting rim 3. During the upward and downward movement of the assembly the flange of the supporting plate 14 as well as the three spacer plates slide along the inner wall of the casing 15. The slidability of the assembly of sleeves, spacer plates and supporting plate serves to facilitate the assembly and disassembly of these parts of the cleaner. If a stream of contaminated gas flows into the cleaner through conduit 1 via nozzle 2 the contaminant particles in the gas stream will mainly move downwardly in vertical direction and will largely pass the annular slits between the various sleeves without leaving the sleeves via said slits to enter the space surrounding the assembly of sleeves. If impurities deposit against the inner side of the sleeves, said impurities, especially if they are in liquid form, will collect and flow downwardly. Droplets will then form at the lower rim of each sleeve. However, since each sleeve is provided with a funnel-shaped portion of restricted passage area, a droplet which has formed on the rim of a sleeve will flow downwardly at .a location relatively far away from the slit between two sleeves, so that cleaned gas escaping through said slit will not be capable of entraining such droplets.

An advantage of the construction according to the invention is that the sleeves can be perfectly identical which simplifies their manufacture. The cleaned gas will collect in the casing 15 above plate 14 and will be discharged through conduit 16. Any gas leaving sleeve 9 at the lower end thereof can enter the space in casing 15 via some apertures 26 which are provided in the supporting plate 14. Impurities in chamber 26 will be discharged through duct 17.

I claim:

1. A gas cleaner comprising means for supplying a stream of gas in a given direction and comprising a plurality of hollow sleeves each of which includes a cylindrical portion and a frusto-conical portion tapering from the cylindrical portion; means supporting the sleeves in axially aligned relation with the frusto-conical portions thereof all facing away from said supply means and projecting with clearance within the cylindrical portion of an adjacent sleeve and with said sleeves supported in decreasing spaced relation in the direction of the gas stream to form decreasing annular slits between adjacent sleeves, gas discharge means surrounding the hollow sleeves, said means which supports the sleeves including means for axially varying the position of the sleeves within the discharge means, and a collecting chamber in alignment with the means supplying the gas and in communication therewith.

2. A cleaner as claimed in claim 1 wherein said sleeves are vertically arranged and said supply means supplies the gas downwardly therethrough, said collecting chamber being located below the sleeves.

3. In a gas cleaner having gas supply means for the supply of gas in a'determinable direction, gas discharge means surrounding the gas supply means and a collecting chamber in alignment with the gas supply means and in communication therewith, said supply means comprising: a plurality of axially aligned substantially identical sleeves defining a common axis, said sleeves each including a cylindrical portion of common diameter in spaced relation relative to cylindrical portions of adjacent sleeves to form slits therewith to provide flow paths for gas within the sleeves to the gas discharge means surrounding the sleeves, the sleeves each further including a frusto-conically shaped portion concentric with said axis and tapering from a respective cylindrical portion away from said supply means to project within the cylindrical portion of an adjacent sleeve while maintaining a space therewith to permit outflow of gas Within said sleeves through said spaces and slits to said gas discharge means, said cylindrical portions of the sleeves being in gradually diminishing spaced relation in the direction of the gas stream to form gradually diminishing sized slits.

4. For a gas cleaner, a gas supply means for supplying a stream of gas, gas discharge means surrounding said supply means and a collecting chamber in alignment with and in communication with the gas supply means, said supply means comprising: a plurality of substantially identical sleeves, said sleeves each including a cylindrical portion of common diameter and a frusto-conical portion tapering from the cylindrical portion, said sleeve defining a common axis and being in axially spaced relation, said sleeves further being in internesting relation with the frusto-conical portions of respective sleeves projecting with clearance within the cylindrical portions of adjacent sleeves, all of said sleeves facing in the same direction with the frusto-conical portions thereof projecting in a direction away from said supply means, the sleeves being in axially decreasing spaced relation in the direction of the gas stream.

5. For a gas cleaner: gas supply means, gas discharge means surrounding the gas means and a collecting chamber in alignment with and in communication with the gas supply means, said supply means comprising: a plurality of substantially identical sleeves, said sleeves each including a cylindrical portion of common diameter and t a funnel shaped portion tapering from the cylindrical portion and having a narrow outlet end; and means supporting the sleeves in axially aligned and spaced relation with the funnel shaped portions all facing away from said supply means and projecting with clearance within the cylindrical portions of the respective adjacent sleeves to permit gas within the sleeves to escape to the discharge means surrounding the sleeves via the spacing between adjacent sleeves while the flow of gas between successive sleeves is restricted through the outlet ends in the funnel shaped portions, said sleeves being supported in decreasing spaced relation in the streamwise direction of flow of the gas through the supply means.

References Cited by the Examiner UNITED STATES PATENTS 2,345,859 4/1944 Randolph 308 FOREIGN PATENTS 134,745 9/ 1933 Austria.

HARRY B. THORNTON, Primary Examiner.

WESLEY S. COLE, Examiner. 

1. A GAS CLEANER COMPRISING MEANS FOR SUPPLING A STREAM OF GAS IN A GIVEN DIRECTION AND COMPRISING A PLURALITY OF HOLLOW SLEEVES EACH OF WHICH INCLUDES A CYLINDERICAL PORTION AND A FRUSTO-CONICAL PORTION TAPERING FROM THE CLYLINDRICAL PORTION; MEANS SUPPORTING THE SLEEVES IN AXIALLY ALIGNED RELATION WITH THE FRUSTO-CONICAL PORTIONS THEREOF ALL FACING AWAY FROM SAID SUPPLY MEANS AND PROJECTING WITH CLEARANCE WITHIN THE CLYLINDRICAL PROTION OF AN ADJACENT SLEEVE AND WITH SAID SLEEVES SUPPORTED IN DECREASING SPACE RELATION IN THE DIRECTION OF THE GAS STREAM TO FORM DECREASING ANNULAR SLITS BETWEEN ADJACENT SLEEVES, GAS DISCHARGE MEANS SURROUNDING THE HOLLOW SLEEVES, SAID MEANS WHICH SUPPORTS THE SLEEVES INCLUDING 